A structure to form an energy well within a Carbon nanotube is described. The structure includes a doped semiconductor region and an undoped semiconductor region. The Carbon nanotube is between the doped semiconductor region and the undoped semiconductor region. The structure also includes a delta doped semiconductor region. The undoped semiconductor region is between the Carbon nanotube and the delta doped region. The delta doped semiconductor region is doped opposite that of the doped semiconductor region.

 
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